Krell Master Reference Subwoofer.. These retailed for $40,000.
The Master Reference Subwoofer (MRS) is all Krell, hugely powerful, all aluminum, and as heavy as a boulder. Capable of a manufacturer-rated 120dB at 20Hz, the MRS has enough output for huge spaces. The MRS has a 2600W amplifier based on the Krell FPB-750 that powers the two 15" drivers (each capable of 3" excursion), while the cabinet is constructed from 1" aluminum side panels and 2" baffles. The crossover electronics are even housed in their own metal case for isolation from the woofers. Original retail price: $28,000-$40,000. Shipping weight: 480 lbs. Buyer pays freight cost, please send your post code for an accurate quote. Worldwide voltage and shipping available Learn More

Krell Evolution 707 3D in black latest upgrades, unit is afactory sealed demo. . As we are Krell dealers you will have the balance of warranty which is three years. It can ship from there to you anywhere. The USA retail for this unit is $31500, more internationally
World's best sounding surround sound processor (better sound than Krell's best two channel preamp in two channel mode)
Fully loaded, international software, will work in any country.
Krell is introducing for the 707 a new 4k switcher with HDR available Summer of 2019 for $1000! Learn More

Krell Solo 575 XD
Mono Power Amplifier
575 Watt Amplifier Featuring Krell iBias Technology
Circuitry Highlights
Krell iBias Class A technology allows our latest amplifiers
to run in full Class A mode to full power while minimizing
heat generation.
All signal gain is realized in the current domain using discrete,
proprietary, multiple-output current mirrors with
extraordinary open loop linearity. There are no generic
integrated circuits or op amps used anywhere.
Current mirrors in the final gain stages use a new output
power device that operates at a 73% higher voltage,
delivers almost 10% more current, and offers 120 watts
of additional power handling capability as compared to
previous devices.
The signal path is fully complementary and balanced .
Independent complementary pre driver and driver
stages for the positive and negative output transistors
make the output stages extremely fast and linear.
Krell amplifiers are fully direct-coupled, with no capacitors
in the audio signal path. This design gives the Krell
amplifiers lower internal impedance, which allows
firmer, more precise control of your speakers.
Krell CAST Circuitry delivers the purest signal when connected
to Krell CAST equipped preamplifiers.
Power Supply Highlights
Four 750VA toroidal transformers feed amplifier modules
that include the audio circuitry, rectifier, and power supply
filtering mounted to an individual heat sink.
This design shortens the electrical path from the power supply
to the output transistors, reducing the overall impedance
and allowing the circuit to respond faster and control the
speakers better and more accurately.
Feature Highlights
Network connectivity brings convenience, monitoring, and
reporting to end users from any smartphone, tablet, or laptop.
Amplifier configuration options include display brightness
and timeout. For energy conservation, the amplifiers can be
programmed to power off at a preset time of inactivity.
Individual channels can be muted and firmware updates can
be initiated from the web server.
Excessive current, output DC, fan speeds, short circuit, and
overheating are all monitored in real time. Messages are displayed
on the front panel and reported on the web server
interface. Additionally. end users can be sent an email notifying
them of any operational anomalies. Learn More

Krell Evolution 707 3d silver, latest factory updates, we can ship this in your desired voltage, excellent, original packing. One year factory warranty
We can have this shipped in your desired voltage worldwide
New Krell 4k switcher with HDR available Summer of 2019 for $1000! Learn More

Krell Solo 375 XD Price is per mono amplifier
Mono Power Amplifier
375 Watt Amplifier Featuring Krell iBias Technology
Krell iBias Class A amplifiers are the first to deliver the rich musicality of Class A amplifiers, the uncompromised dynamics
of classic Krell amplifiers, and the efficiency and low power consumption of Class G and H amplifiers
Circuitry Highlights
Krell iBias Class A technology allows our latest amplifiers
to run in full Class A mode to full power while minimizing
heat generation.
All signal gain is realized in the current domain using discrete,
proprietary, multiple-output current mirrors with
extraordinary open loop linearity. There are no generic
integrated circuits or op amps used anywhere.
Current mirrors in the final gain stages use a new output
power device that operates at a 73% higher voltage,
delivers almost 10% more current, and offers 120 watts
of additional power handling capability as compared to
previous devices.
The signal path is fully complementary and balanced .
Independent complementary pre driver and driver
stages for the positive and negative output transistors
make the output stages extremely fast and linear.
Krell amplifiers are fully direct-coupled, with no capacitors
in the audio signal path. This design gives the Krell
amplifiers lower internal impedance, which allows
firmer, more precise control of your speakers.
Krell CAST Circuitry delivers the purest signal when connected
to Krell CAST equipped preamplifiers. Learn More

Krell Cipher $12000 retail, six month warranty. Original box/remote,everything.
Excellent condition
All signals are fed into a custom designed Krell anti-jitter module that reduces jitter to a virtually immeasurable level. From there, signals are fed to a 24 bit/192 KHz digital filter and then to a pair of balanced 24-bit/192 kHz digital-to analog converters (DACs). Conventional players use one DAC for both channels and convert the current output of the DACs to voltage, a process that invariably causes signal distortion. Instead, the Cipher uses one DAC per channel and feeds the native balanced current output directly to Krell Current Mode circuitry. Removing the typical current-to-voltage stage found in conventional players eliminates distortions associated with this conversion. Balanced DACs maintain a dual differential balanced signal from the output of the DACs to the output connections. This lowers distortion and improves signal to noise ratio to their maximum levels. Core Krell technologies of discrete, complementary, direct coupled circuitry are employed throughout the surface mount based output stage. Evolution CAST and balanced connections are included for optimal stereo playback. A complete Evolution (source, preamp, amplifier) system, connected in CAST, reduces the number of voltage gain stages to the minimum: one. The resulting noise floor approaches the theoretical limit of technology Outputs are also included for Multichannel SACD playback.
The backbone of all audio components is the power supply which is often minimized in lesser players. The Cipher includes independent power supplies for the drive mechanism, digital, and analog sections to maintain signal isolation between these circuit areas. The Cipher's linear power supply is sourced directly from the designs used in Krell Evolution e Series amplifiers. A custom-wound toroidal power transformer, 10 times larger than those found in typical players, provides tremendous current reserves and assures low-noise analog stage operation. Extensive multi-regulation delivers rock-steady power to all gain stages, ensuring maximum dynamic impact that can get muted in players using switching or digital power supplies.
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Krell Duo 125XD
Krell iBias Class A amplifiers are the first to deliver the rich musicality of Class A amplifiers, the uncompromised dynamics
of classic Krell amplifiers, and the efficiency and low power consumption of Class G and H amplifiers.
Circuitry Highlights
Krell iBias Class A technology allows our latest amplifiers
to run in full Class A mode to full power while minimizing
heat generation.
All signal gain is realized in the current domain using discrete,
proprietary, multiple-output current mirrors with
extraordinary open loop linearity. There are no generic
integrated circuits or op amps used anywhere.
Current mirrors in the final gain stages use a new output
power device that operates at a 73% higher voltage,
delivers almost 10% more current, and offers 120 watts
of additional power handling capability as compared to
previous devices.
The signal path is fully complementary and balanced .
Independent complementary pre driver and driver
stages for the positive and negative output transistors
make the output stages extremely fast and linear.
Krell amplifiers are fully direct-coupled, with no capacitors
in the audio signal path. This design gives the Krell
amplifiers lower internal impedance, which allows
firmer, more precise control of your speakers.
Power Supply Highlights
One 750VA toroidal transformer feeds amplifier modules
that include the audio circuitry, rectifier, and power supply
filtering mounted to an individual heat sink.
This design shortens the electrical path from the power supply
to the output transistors, reducing the overall impedance
and allowing the circuit to respond faster and control the
speakers better and more accurately.
Feature Highlights
Network connectivity brings convenience, monitoring, and
reporting to end users from any smartphone, tablet, or laptop.
Amplifier configuration options include display brightness
and timeout. For energy conservation, the amplifiers can be
programmed to power off at a preset time of inactivity.
Individual channels can be muted and firmware updates can
be initiated from the web server.
Excessive current, output DC, fan speeds, short circuit, and
overheating are all monitored in real time. Messages are displayed
on the front panel and reported on the web server
interface. Additionally. end users can be sent an email notifying
them of any operational anomalies.
• 125 Watts into 8 Ohms
• 2 ea - Single-ended RCA and Balanced
XLR Inputs
• 1 RJ 45 Ethernet Port
• 1 12V Trigger Input
• WBT Speaker Binding Posts
• Optional Rack Mount Kit
• 17 W, 7 H, 21 D in
• 43.3 W, 17.7 H, 53.1 D cm
• Weight: 53 lbs, 24 kg Learn More

small profile package utilizing huge
internal heat sinks to support Class A, balanced, and
Krell Current ModeTM topology
• Evolution CASTTM, voltage balanced, and singleended
inputs.
Evolution CAST, which stands for Current Audio
Signal Transmission, is a proprietary method of sending
the audio signal between components in the current
domain, from a high impedance transmitter to a
low impedance receiver. Krell components connected
in Evolution CAST act together as an electrically unified
whole, free from the deleterious effects normally
inherent in connecting cables operating in the voltage
domain.
• Low feedback topology; only 8 dB of nested local
feedback utilized. No global feedback is used.
• Push-pull output stage with 10 pair of ultra high
speed, high current, output transistors• Push-pull driver stage configuration resembling a
miniature output stage
This unique circuit actually powers the speaker load
when the audio signal is at the zero-crossing point.
Notch distortion is effectively eliminated, maintaining
the benefits of Class A operation with the efficiency of
an A/B design.
• Massive 3 kW torroidal transformer, four 35 amp
bridge rectifiers, and 110,000 microfarads of filter
capacitance, ensure ample current under the most
demanding circumstances.
• A second low current transformer stabilizes voltage
for ultra-quiet operation.
• Internal high current line conditioning circuitry filters
RF noise on the AC Mains and compensates for asymmetric
power waveforms and DC on the AC Mains.
Protection circuitry continuously monitors all amplifier
operations.
• 12 V trigger controllable
We can Change it to your desire voltage
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\Krell KMA 100 MK2 monos, LARGE! 95lbs each uncrated. recapped, biased, legendary class A mono amplifiers legendary class A, these are original pics, the faceplates are aluminum, we will clean them up quite a bit.
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Krell KRC two piece $6900 preamplifier with remote and original box/packing, recapped
Description: Solid-state remote-controlled preamplifier. Frequency response: 20Hz–20kHz ±0.02dB; 0.2Hz–400kHz +0.0, –3dB. Distortion: <0.01% THD at and 20kHz. S/N ratio: >95dB, unweighted. Input impedance: 47k ohms. Output impedance: 5 ohms. Maximum output voltage: 14V rms.
Dimensions: 19" W by 2.75" H by 14.5" D. Weight: 29 lbs (shipping).
The KRC is set apart from previous Krell preamps by its remote-control capability. Level, balance, mute, input selection, tape-monitor selection, absolute phase, and gain (the LED-illuminated high position provides an additional 6dB of amplification) are all accessible either from the front panel or from the hefty remote control. The latter also duplicates the bias-level meter on/off controls found on the Krell S-Series power amplifier remotes (footnote 1). The balance "control" provides up to 4dB of attenuation in 1dB steps, or off, for either channel. The volume is controlled via a custom-designed, motor-driven, continuously variable potentiometer. When the volume is operated via the remote, a red LED on the control knob illuminates, so the setting can be seen from across the room.
The KRC also provides an unusual degree of input and output protection. Faults are sensed, disabling the offending input or output until the problem is cleared. Problems are indicated by means of flashing input LEDs (for input faults) or a flashing blue pilot-light LED (for output fault)
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Krell Altair Reference $5500 low profile amplifier with separate power supply from the 1990's. Original boxes Designed as a reference amplifier for apartment sized systems. Power suppy caps just recapped. Learn More

Krell Digital connect. $4000 retail in the USA, more overseas.
Connect
Stream Player
The Krell Connect, the ultimate in high-resolution audio streaming technology. From FLAC to WAV, MP3 and WMA, the Connect plays back up to 192kHz/24-bit audio plus Internet radio, all to Krell's highest fidelity standards.
The Wi-Fi equipped Connect is available with a built-in Digital-to-Analog Converter (DAC) module. The DAC-equipped Connect has a 32-bit ESS Sabre chipset with discrete, direct-coupled analog circuitry outputting via RCA or balanced audio outputs.
Extensive audio libraries are easy to navigate via the Connect's built-in 3.5-inch QVGA LCD screen. Alternately, a full-featured iOS app offers full control from anywhere in the home.
In addition to playback of FLAC and WAV files up to 192kHz/24-bit, the Connect also streams Ogg, WMA, and MP3. Unlike some music streamers, gapless playback is possible, allowing for no breaks between album tracks. Live concert albums, for example, can be played as a seamless, uninterrupted experience
Internet radio gets the same conversion as the high-resolution files (on DAC-equipped models), providing the best possible sound quality from on line streaming content.
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Krell KSA100 MK II excellent cosmetics, there are some green markings in the picture which were removed. We can ship this in your desired voltage
Description provided by highendclassics.com:
The Krell KSA-100 Class A poweramplifier was the first stereo amplifier from Krell Audio Industries. At the start of the eighties Connecticut witnessed the birth of another highend audio company within its stateborders: Krell Industies. ‘Class A power to the people’ could have been one of the inspiring thoughts for Daniel D’Agostino chief designer of Krell Industries. Of course there were already some Class A designs in the domain of the power amplifier but most and probably all of them were confined to relatively small powerratings. Even the huge monaural Class A amplifier from Levinson, the ML-2’s, could only muster 30 to 40 Watts of power at 8 Ohms. Other noteworthy low power Class A designs were John Bedini’s 25/25 Class A amp and Jean Hiraga’s ‘Hiraga Classe A’. The only high power Class A amp in those days was a stereo 125 Watt Class A design from the SUMO electric company named ‘The Gold’ designed by James Bongiorno. D’Agostino envisioned and designed an array of high powered Class A amps in which the KSA-100 (abbreviation KSA stands for Krell Stereo Amplifier) was the most powerful stereo amplifier rated at 100 Watts Class A power at 8 Ohms.
Technical
The KSA-100 is a configuration of two completely separated amps only sharing the same huge chassis. Each amp has its own powersupply (one Avel Lindberg 1250 VA toroidal, two 40,000 uF Sprague or Mallory large cans per channel), driverboard and poweroutputsection. Another so called true dual mono design was the ML-3 from Levinson but this amp was biased in AB mode. To get rid of all the Class A generated heat from the outputsection Krell opted for forced cooling with Papst fans blowing down (the MK II version blew upwards in sync with the natural convection flow of heat) trough circular arranged heatsinks with eight TO3 encased powertransistors per channel attached to it. As a matter of fact the ‘The Gold’ from the SUMO company also used fans to cool down the amp. Using active cooling instead of natural convection kept size and cost in check because huge expansive heatsinks would be needed to drop off the 650 Watts continuous power consumption. Seven years later Krell did make huge convection cooled mono-amps as their reference series (KRS-100 & KRS-200) with the same Class A output but with a significant raise in price and weight compared to the forced cooled versions.
Although Krell has always been strongly associated with Class A biasing it’s their ability to drive extremely tough loads, like the renowned amplifier killer the Apogee Scintilla (1 Ohm version) fullrange ribbonspeaker, that really illustrated the kind of DNA a Krell was made of. Only a few other amplifiers in this era, and most of them were amps with low powerratings, could drive speakers at such low impedences. Opening up the “hood ” of the amp gives you a strong visual indication of the ‘brute force’ method used to get an unflappable amp that could drive anything on the market then and today. D’Agostino’s assault on the highend poweramplifier market was very successful worldwide due to these first designs. After Levinson and Threshold, Krell established itself as a strong contender on the highend audio-market.
Sound quality
This range of first Krell designs redefined the meaning of bass-slam. The KSA-100 sounded much more powerful then it’s relatively modest rating of 100 Watts with acceptable levels of refinement in the middle and high regions of the frequency-spectrum. This stereo-amp is a alround workhouse that was often mated with tube preamplifiers from Audio-Research and Conrad Johnson. Not delicacy and transparancy as the best offerings from Levinson and Threshold but nevertheless highly recommend.
Krell KSA-100
Type: 100 Watt class-A stereo power amplifier
Introduction: 1981
Discontinued:1987
Power rating (manufacturer)
8 Ohms 100 Watt
4 Ohms 200 Watt
2 Ohms 400 Watt
1 Ohm 800 Watt
0.5 Ohm 1200 Watt Learn More

Krell kav-280p preamp in black, original box manual remote
. The unit is low-slung, but deep (17.25"W x 3"H x 17.25"D), with smoothly rounded corners. Its faceplate is uncluttered, boasting only seven dome-like touch-sensitive buttons (Power, B-1, S-1, S-2, S-3, Tape, and Mute), a 0.5" round IR sensor, a 1.25" x 0.625" display panel (with red characters) and a 1.25" domed electronic-sensing volume control. There are also eight tiny LEDs: one each for the source buttons (also red) and two above the power switch (a blue power on indicator immediately above it and a red one above it to indicate standby mode).
From left to right on the back panel are a pair of XLR inputs (B-1), six pairs of RCA inputs (S-1, S-2, S-3, Tape In, Tape Out, Main Out), and a pair of balanced XLR outputs. An RC-5 input, a pair of 12V DC triggers (in and out), and an IEC power socket round out the package.
The remote also controls other components in the KAV line, such as the KAV-280cd CD player.
The KAV-280p uses surface-mount technology derived from Krell's Current Tunnel technology, as personified by the KCT preamplifier. It's a wide-bandwidth, direct-coupled design that's fully balanced from the inputs to the outputs. That includes the volume control, a really slick digitally controlled resistor-ladder. Learn More

Krell KAV-250p remote controlled
comes with a remote control, lacks a rotary volume control and uses up/down buttons and LEDs instead, it features three single-ended line inputs and one balanced, a tape loop and provision for both balanced and single-ended outputs. Other niceties include full synergy with RC-5 remote control systems for multi-room compatibility and home theatre products. It takes only a few moments to get used to a preamp devoid of knobs and bearing only push buttons, but I found myself using the remote control nearly all the time.
At 483x89x394mm (WHD), the KAV-250p could be mistaken for the '300i, and it stacks perfectly with the '300cd. What distinguishes it visually from the KRC-3 is the lack of a black strip in the middle of the fascia. Other aspects of the KRC-3 which go some way to qualify a higher price tag are polarity inversion lacking on the '250, a (digital) rotary volume control and seemingly more substantial build quality. That aside, the KAV-250p employs Krell's Current Mode Gain Class A, fully complementary circuitry, microprocessor control over level, balance and source switching, dry-contact relays for the input switching and a typically substantial toroidal power supply. Learn More